VE: properly make buffer dirty on E and X

blk/112

@@ -5,12 +5,7 @@
     SWAP _rbufsz MOVE ( n )
     ( get to next line - n )
     DUP EDPOS @ 0xffc0 AND 0x40 + -^ _cpos ( n a )
-    SWAP 0 FILL
+    SWAP 0 FILL BLK!!
     EDPOS @ 64 / _pln ;
 : E FBUF _blen X ;
 : Y FBUF _blen icpy ;
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